CN102588030A - Auxiliary valve driving mechanism of engine - Google Patents
Auxiliary valve driving mechanism of engine Download PDFInfo
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- CN102588030A CN102588030A CN2011100013737A CN201110001373A CN102588030A CN 102588030 A CN102588030 A CN 102588030A CN 2011100013737 A CN2011100013737 A CN 2011100013737A CN 201110001373 A CN201110001373 A CN 201110001373A CN 102588030 A CN102588030 A CN 102588030A
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- auxiliary
- valve
- rocker arm
- driving mechanism
- motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
- F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
- F01L13/0026—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio by means of an eccentric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0276—Actuation of an additional valve for a special application, e.g. for decompression, exhaust gas recirculation or cylinder scavenging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
- F02D9/06—Exhaust brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
- F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/10—Providing exhaust gas recirculation [EGR]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses an auxiliary valve driving mechanism of an engine, which comprises an auxiliary cam, an auxiliary rocker arm shaft, an auxiliary rocker arm, an eccentric rocker arm shaft sleeve and a shaft sleeve driving device, wherein the eccentric rocker arm shaft sleeve is arranged in an axle hole of the auxiliary rocker arm; the auxiliary rocker arm shaft is eccentrically arranged in the eccentric rocker arm shaft sleeve; one end of the auxiliary rocker arm forms a kinematic pair with the auxiliary cam; and the shaft sleeve driving device drives the eccentric rocker arm shaft sleeve to turn between a non-operation position and an operation position. The auxiliary valve driving mechanism of an engine disclosed by the invention provides an independent auxiliary valve driving mechanism of a regular valve driving mechanism without increasing valve lift of the regular valve during braking, avoids mutual affection between ignition operation and braking operation of an engine, increases the braking power, reduces the temperature of an oil nozzle, reduces the valve part wear and improves the reliability and durability of the engine. The special braking cam and special braking rocker arm braking device of the auxiliary valve driving mechanism have the advantages of excellent performance, simple structure, convenient mounting, low cost, high reliability and durability and the like.
Description
Technical field:
The present invention relates to mechanical field, relate in particular to vehicle motor, particularly the valve actuation of vehicle motor technology specifically is a kind of auxiliary valve driving mechanism of motor.
Background technique:
In the existing technology, the method for the conventional valve actuation of vehicle motor is behaved and is known altogether, and it uses the history in existing more than 100 year.But owing to the extra demand to engine emission and engine braking, increasing motor need increase auxiliary valve motion, as be used for the valve motion of exhaust gas recirculation and the valve motion of engine braking on the basis of conventional valve motion.Wherein, engine brake has become the device that heavy-duty commercial vehicle engine must be joined gradually.
The engine braking technology is widely known by the people.Only need temporarily to convert motor into compressor.Cut off fuel oil in the transfer process; When the approaching end of engine piston compression stroke, open exhaust valve; Allowing to be compressed gas (being air during braking) is released; The motor energy that pressurized gas absorbed in compression stroke can not turn back to engine piston at expansion stroke subsequently, but dissipate through the exhaust and the radiation system of motor.Final result is effective engine braking, slows down the speed of vehicle.
Engine braking has many different types.Generally, the engine braking running is outside the conventional valve motion of motor, to add the auxiliary valve motion that is used for engine braking.How to produce according to this auxiliary valve motion, engine braking can be defined as:
1.I h type engine h braking: auxiliary valve motion is introduced from the existing contiguous cam of motor, produces so-called " all can " and (Jake) brakes;
2.II h type engine h braking: auxiliary valve motion is through changing existing cam curve, produce motion and lose the h type engine h braking, braking like the integrated form rocking arm;
3.III the h type engine h braking: auxiliary valve motion comes from special-purpose brake cam, through special-purpose brake rocker arm, produces special-purpose braking valve motion;
4.IV h type engine h braking: auxiliary valve motion is that the valve motion through direct change available engine obtains, and produces the h type engine h braking of losing heart usually; And
5.V h type engine h braking: auxiliary valve motion is used special valve system, generates a special valve (the 5th valve) engine braking.
A precedent of engine braking apparatus is that the U.S. Patent number 3220392 that was provided in 1962 by comings (Cummins) discloses, according to the braking system of this patent manufacturing commercial very successful.But, this type of engine braking system is the annex of overhead on motor.For this type of device is installed, between cylinder and valve gap, to add packing ring, therefore, increased height, weight and the cost of motor extraly.
Above-mentioned engine braking system passes to the outlet valve that will open through oil hydraulic circuit with the machinery input.Be usually included in reciprocating main piston in the master piston bore on the oil hydraulic circuit; This to-and-fro motion comes from the Engine Mechanical input; Such as the shaking of oil sprayer rocking arm, the hydraulic fluid that moves through of main piston passes to the sub-piston on the oil hydraulic circuit, makes its to-and-fro motion in slave piston bore; Sub-piston acts on the outlet valve directly or indirectly, produces the valve actuation of engine braking running.
There is another shortcoming by hydraulically powered conventional engines braking system; Be the contractibility or the distortion of hydraulic system; This flexibility with fluid is relevant, and a large amount of compressions that high flexibility causes brake valve to rise reduce, and valve rises reduces the increase that causes valve to carry; And the increase that valve carries causes higher flexibility, causes a kind of vicious circle.In addition, the valve liter that is caused by hydraulic pressure distortion reduces to increase along with the increase of engine speed, and to rise trend on the contrary with the desired brake valve of engine braking performance.In order to reduce flexible hydraulic, must use large diameter hydraulic piston, increase volume and weight.And oily stream need make enlarged bore piston stretch out for a long time or withdraw, and causes that braking system inertia is big, reaction is slow.
The earliest with engine braking system be integrated in the existing parts of motor be the U.S. Anderson (Jonsson) in nineteen sixty-eight at No. 3367312 disclosed a kind of integrated form compression-release engine braking system of U. S. Patent.This braking system is lost type (lost motion) engine braking for motion, need make amendment to the conventional cam of motor.Except the conventional boss with the power running strengthens, also increased the braking boss that is used for engine braking on the same cam.The rocking arm of this braking system is installed on the eccentric cylinder of pitman arm shaft, through rotating pitman arm shaft, changes the central position of shaking of rocking arm, thereby between cam and valve, produces or eliminate the gap of " losing motion ".When the gap formed, the motion of braking boss was lost on the cam, and motor only produces the power running; When eliminated in the gap, the motion of all boss on the cam (conventional boss after the increasing and braking boss) all was delivered to valve, produces the auxiliary valve motion of engine braking running.
The braking system of Anderson is rotated an eccentric pitman arm shaft, changes the central position of shaking of all rocking arms simultaneously, need overcome the active force of a lot of valve spring on rocking arm, has caused very big hydraulic driving system.Another shortcoming of the braking system of Anderson comes from the conventional boss that strengthened and when engine braking, produces the conventional valve lift curve that has strengthened, and has reduced braking force, has increased the temperature of oil nozzle.
U. S. Patent No. 5335636 (1994) discloses other a kind of integrated form rocking arm braking system.This braking system also need be made amendment to the conventional cam of motor.Except the conventional boss with the power running strengthens, also increased the braking shoulder that is used for engine braking on the same cam.The braking shoulder is the molded lines of level altitude (permanent high), and the type braking that can only be used for losing heart can not be used for the compression-release braking.In addition, the rocking arm of this braking system is installed on the excentric sleeve, and excentric sleeve is installed on the pitman arm shaft again.Through the eccentric rotation axis cover, change the central position of shaking of rocking arm, thereby between cam and valve, produce or eliminate the gap of " losing motion ".When the gap formed, the motion of braking shoulder was lost on the cam, and motor only produces the power running; When eliminated in the gap, the motion of all boss of cam (conventional boss after the increasing and braking shoulder) all was delivered to valve, produces the auxiliary valve motion of engine braking running.Also have, the rocking arm of this braking system acts on the air valve bridge, opens two valve brakings simultaneously.
Above-mentioned integrated form rocking arm braking system still need strengthen conventional boss, and conventional valve lift strengthens when causing engine braking, and braking force descends, and the oil nozzle temperature raises.In addition, above-mentioned integrated form rocking arm braking system can only be used for disappointing type braking, can not be used for the compression-release braking.The braking ability of the type that loses heart braking is braked far below compression-release.Also have, open the dual valve braking and cause whole valve actuating mechanism to bear double brake load, increase wearing and tearing, reduce reliability and durability.
U. S. Patent No. 5647319 (1997) discloses other a kind of integrated form rocking arm braking system that adopts excentric sleeve.This braking system also is that brake valve is upgraded to permanent high disappointing type braking, but it has two kinds of different brake valve liters.When engine low rotation speed (below 2000 rev/mins), use little brake valve liter; When the high rotating speed of motor (more than 2000 rev/mins), use big brake valve liter.In addition; The igniting of motor running and the shared same cam of braking running in all integrated form rocking arm braking system; Need to revise the existing conventional boss, the influencing each other of cause lighting a fire running and braking running, braking force descends, the oil nozzle temperature raises, the wearing and tearing of valve based part increase and the reliability and the durability of motor reduce.
Summary of the invention:
The object of the present invention is to provide a kind of auxiliary valve driving mechanism of motor; The auxiliary valve driving mechanism of described this motor will solve in the existing technology integrated form rocking arm braking system need revise the existing conventional cam; And the running and the braking running influences each other, braking force descends, the oil nozzle temperature raises, the wearing and tearing of valve based part increase and the reliability of motor and technical problem that durability reduces of causing lighting a fire also will solve height, weight and cost techniques problem that the Traditional engine braking device increases motor simultaneously.
The auxiliary valve driving mechanism of this motor of the present invention is used to produce the auxiliary valve motion of motor, and described motor comprises a conventional valve actuating mechanism; Described conventional valve actuating mechanism comprises conventional cam, conventional pitman arm shaft, conventional rocking arm and valve, and the described conventional rocking arm that moves through of described conventional cam passes to described valve to produce the conventional valve motion of motor, wherein; Described auxiliary valve driving mechanism comprises auxiliary cam, auxiliary rocker arm axle, auxiliary rocker arm, eccentric swing arm sleeve and axle sleeve drive unit, and described eccentric swing arm sleeve is arranged in the axis hole of described auxiliary rocker arm, and described auxiliary rocker arm axle is arranged in the eccentric swing arm sleeve; The axle center of auxiliary rocker arm axle and the biasing of the axle center of eccentric swing arm sleeve; One end of auxiliary rocker arm and described auxiliary cam constitute kinematic pair, and the other end of auxiliary rocker arm is positioned at the top of described valve, and described axle sleeve drive unit drives eccentric swing arm sleeve and between off position and operating position, rotates; At described off position; Auxiliary rocker arm shake center line away from valve, auxiliary rocker arm separates with valve, at described operating position; Auxiliary rocker arm shake center line near valve; Auxiliary rocker arm contacts with valve, and the transmission of movement of auxiliary cam is given valve, produces the auxiliary valve motion of motor.
Further, have phase difference between the open phase in open phase in the described auxiliary valve motion and the described conventional valve motion, the valve of auxiliary valve motion rises the valve liter less than conventional valve motion.
Further, described auxiliary cam comprises special-purpose brake cam, and described auxiliary rocker arm comprises special-purpose brake rocker arm, and the auxiliary valve motion of described motor comprises the valve motion that is used for engine braking.
Further, described auxiliary rocker arm axle and described conventional pitman arm shaft are same pitman arm shaft, and described auxiliary rocker arm and conventional rocking arm are installed on the described pitman arm shaft abreast.
Further; Described axle sleeve drive unit is the internally-arranged type driving mechanism; It is interior and adjacent with eccentric swing arm sleeve that the axle sleeve drive unit is arranged on auxiliary rocker arm; Described internally-arranged type driving mechanism comprises driven plunger, and described driven plunger is positioned at auxiliary rocker arm, and driven plunger drives eccentric swing arm sleeve and between off position and operating position, rotates.
Further; Described axle sleeve drive unit is the externally-arranged type driving mechanism; Described externally-arranged type driving mechanism comprises actuator, and described actuator is positioned at outside the described auxiliary rocker arm, and actuator drives eccentric swing arm sleeve and between off position and operating position, rotates.
Further, described axle sleeve drive unit is a continuously variable driving mechanism, and described continuously variable driving mechanism drives described eccentric swing arm sleeve, and the operating position of described eccentric swing arm sleeve is adjustable continuously.
Further, comprise secondary spring in the described auxiliary valve driving mechanism, described secondary spring is biased in described auxiliary rocker arm the position of avoiding impacting valve.
Working principle of the present invention is: when the auxiliary valve motion that needs motor when producing engine braking, the braking control mechanism of motor is open-minded, to auxiliary valve driving mechanism fuel feeding.Oil pressure promotes the axle sleeve drive unit, and the axle sleeve drive unit drives eccentric swing arm sleeve and forwards operating position to from off position.Auxiliary rocker arm shake center line (down) near valve, eliminated the gap between auxiliary cam and the valve, auxiliary rocker arm links to each other with valve.The transmission of movement of auxiliary cam is given valve, produces the auxiliary valve motion of engine braking.When not needing engine braking, the braking control mechanism of motor cuts out emptying, and the axle sleeve drive unit of auxiliary valve driving mechanism is moved back into off position with eccentric swing arm sleeve from operating position.Auxiliary rocker arm shake center line (up) away from valve, formed the gap between auxiliary cam and the valve, auxiliary rocker arm separates with valve.The motion of auxiliary cam can not pass to valve, and motor breaks away from the braking running, gets back to routine (igniting) state.
The present invention and prior art are compared, and its effect is actively with tangible.The invention provides independently auxiliary valve driving mechanism of a kind of and existing conventional valve actuating mechanism, comprise special-purpose brake cam and special-purpose brake rocker arm, can not need revise the existing conventional cam; Do not increase the valve liter of conventional valve during braking; Avoid influencing each other between engine ignition running and the braking running, increased braking force, reduced the oil nozzle temperature; Reduce the wearing and tearing of valve based part, improved the reliability and the durability of motor.Special-purpose brake cam of the present invention and special-purpose brake rocker arm braking device have advantages such as superior performance, simple in structure, easy for installation, with low cost and reliability and durability.
Description of drawings:
Fig. 1 is an embodiment's the schematic representation of the auxiliary valve driving mechanism of motor of the present invention.
Fig. 2 is another embodiment's the schematic representation of the auxiliary valve driving mechanism of motor of the present invention.
Fig. 3 is the schematic representation of an arrangement position relation of auxiliary rocker arm and conventional rocking arm in the auxiliary valve driving mechanism of motor of the present invention.
Fig. 4 is conventional valve motion curve and the schematic representation of auxiliary valve motion (engine braking valve motion) curve among the embodiment of auxiliary valve driving mechanism of motor of the present invention.
Embodiment:
Embodiment 1:
Like Fig. 1, Fig. 3 and shown in Figure 4; The auxiliary valve driving mechanism of present embodiment is an engine braking mechanism; The auxiliary valve motion that is produced is the exhaust valve motion that engine braking is used; The conventional valve motion that is used for motor routine (igniting) running is produced by conventional valve actuating mechanism 200, and conventional valve actuating mechanism 200 is two separate mechanisms with auxiliary valve driving mechanism 2002.
Conventional valve actuating mechanism 200 has a lot of parts; Comprise conventional cam 230, cam follower wheel 235, conventional rocking arm 210; Air valve bridge (also being the valve bridge) 400 and exhaust valve 300; Exhaust valve 300 constitutes by 3001 and 3002, and exhaust valve 300 is biased on the valve seat 320 of engine cylinder-body 500 by the valve spring 3101 and 3102 of motor, and control gaseous flows between engine cylinder (not shown) and outlet pipe 600.Conventional rocking arm 210 is installed on the conventional pitman arm shaft 205 rock typely, with the motion of conventional cam 230, passes to exhaust valve 300, and it is is periodically opened and closed.Conventional valve actuating mechanism 200 also comprises valve clearance adjusting screw 110 and resembles foot pad 114.Valve clearance adjusting screw 110 is fixed tightly on the conventional rocking arm 210 by nut 105.Conventional cam 230 has a conventional boss 220 at interior basic circle more than 225, produce conventional valve lift curve (see Fig. 4 2202), and the routine (igniting) that is used for motor operates.
Auxiliary valve driving mechanism 2002 comprises auxiliary cam 2302 (originally execute and be special-purpose brake cam in the example), auxiliary cam follower 2352, auxiliary rocker arm axle 2052, auxiliary rocker arm 2102 (originally execute and be special-purpose brake rocker arm in the example), eccentric swing arm sleeve 188 and axle sleeve drive unit 100.Eccentric swing arm sleeve 188 is between auxiliary rocker arm axle 2052 and special-purpose brake rocker arm 2102.The convexity 142 (this convexity also can be a pin that is assemblied in addition on the excentric sleeve) that one pin shape is arranged on the eccentric swing arm sleeve 188 places in the grooving 137 of special-purpose brake rocker arm 2102 centres.One end of special-purpose brake rocker arm 2102 links to each other with special-purpose brake cam 2302 through auxiliary cam follower 2352, and the other end of special-purpose brake rocker arm 2102 is positioned on the exhaust valve 3001.Be positioned at braking briquetting 116 on valve bridge 400, the exhaust valve 3001 in the present embodiment for selecting piece installing, that is to say, special-purpose brake rocker arm 2102 can act directly on valve bridge 400 or exhaust valve 3001 and extend on the valve rod.Auxiliary valve driving mechanism 2002 also comprises braking valve clearance adjusting screw 1102 and resembles foot pad 1142.Braking valve clearance adjusting screw 1102 is fixed tightly on the special-purpose brake rocker arm 2102 by nut 1052.Special-purpose brake rocker arm 2102 is biased on the special-purpose brake cam 2302 by brake spring 198 usually, makes can not produce any impact between special-purpose brake rocker arm 2102 and the exhaust valve 3001.
Special-purpose brake cam 2302 has special- purpose braking boss 232 and 233 at interior basic circle more than 2252; 232 are used to produce the compression release of valve; 233 are used to produce the exhaust gas recirculatioon of exhaust valve, 232 and 233 be used to produce engine braking auxiliary valve lifting curve (see Fig. 4 2322 and 2332).Exhaust gas recirculatioon braking boss 233 is to select piece installing in the present embodiment.
The axle sleeve drive unit 100 of auxiliary valve driving mechanism 2002 is a hydraulic driving system, comprise braking control mechanism (not shown), be positioned at special-purpose brake rocker arm 2102 piston hole 260 driven plunger 164 and be communicated with both fluid network.Fluid network comprises fluid passage 213 and the fluid passage 214 in the special-purpose brake rocker arm 2102 in axial fluid passage 211 and radial fluid passages 212, the eccentric swing arm sleeve 188 in the auxiliary rocker arm axle 2052.One annular groove 226 is arranged on the driven plunger 164.Annular groove 226 forms kinematic pair with convexity 142 on the axle sleeve 188, converts the translation of driven plunger 164 rotation of eccentric swing arm sleeve 188 on auxiliary rocker arm axle 2052 into.Driven plunger 164 is usually by spring 156 biasings downward (Fig. 1); Eccentric swing arm sleeve 188 is in off position (eccentric swing arm sleeve 188 thinnest parts are positioned at the lowest part of auxiliary rocker arm axle 2052); Special-purpose brake rocker arm 2102 shake centerline in the highest position, special-purpose brake rocker arm 2102 is away from exhaust valve 3001 (or exhaust valve 3001 open direction).Form a gap 132 between special-purpose brake cam 2302 and the exhaust valve 3001, special-purpose motion of braking boss 232 and 233 can not pass to exhaust valve 3001.Whole engine braking mechanism separates with the normal operation of motor.
When the auxiliary valve motion that needs motor, when just needing engine braking, the braking control mechanism of motor is open-minded, to auxiliary valve driving mechanism fuel feeding.Machine oil comprises fluid passage 211,212,213 and 214 through fluid network, flows to driven plunger 164.Oil pressure overcomes the active force of spring 156, and driven plunger 164 is upwards released in piston hole 260.Annular groove 226 on the driven plunger 164 drives eccentric swing arm sleeve 188 through protruding 142 and on fixed auxiliary rocker arm axle 2052, forwards operating position (wall thickness of eccentric swing arm sleeve 188 that is positioned at the lowest part of auxiliary rocker arm axle 2052 strengthens) to from the off position of Fig. 1.Special-purpose brake rocker arm 2102 shake center line (down) near exhaust valve 3001 (or exhaust valve 3001 open direction), eliminated the gap 132 between special-purpose brake cam 2302 and the exhaust valve 3001, special-purpose brake rocker arm 2102 links to each other with exhaust valve 3001.The special-purpose transmission of movement supply and exhaust door 3001 of braking boss 232 and 233, the auxiliary valve motion of generation engine braking.
When not needing engine braking, the braking control mechanism of motor cuts out emptying, and spring 156 pushes driven plunger 164 downwards in the piston hole 260.Annular groove 226 on the driven plunger 164 drives eccentric swing arm sleeve 188 through protruding 142 and is moved back into off position shown in Figure 1 from operating position.Special-purpose brake rocker arm 2102 shake center line (up) away from exhaust valve 3001, formed the gap 132 between special-purpose brake cam 2302 and the exhaust valve 3001, special-purpose brake cam 2302 and exhaust valve were opened in 3001 minutes.The motion of special-purpose brake cam 2302 can not pass to exhaust valve 3001, and motor breaks away from the braking running, gets back to routine (igniting) state.
Fig. 3 is the schematic representation of a kind of Rankine-Hugoniot relations between auxiliary rocker arm and the conventional rocking arm.The auxiliary rocker arm axle 2052 of the auxiliary exhaust door drive mechanism 2002 among Fig. 1 and Fig. 2 and the conventional pitman arm shaft 205 of the conventional exhaust valve driving mechanism 200 among Fig. 1 are same pitman arm shaft.At this moment, auxiliary rocker arm, promptly special-purpose brake rocker arm 2102 can be installed on the conventional pitman arm shaft 205 with conventional rocking arm 210 abreast, forms position relation as shown in Figure 3.
Certainly, other arrangement position (about, up and down with inside and outside etc.) also is possible.
Fig. 4 is the auxiliary valve driving mechanism embodiment's of the present invention conventional valve motion curve 2202 and the schematic representation of auxiliary valve motion (engine braking valve motion) curve 2322 and 2332.Among conventional valve motion curve 2202 and Fig. 1 in the conventional cam 230 the conventional boss 220 on the basic circles 225 corresponding, by conventional valve actuating mechanism 200 generations.Auxiliary valve motion (engine braking valve motion) curve 2322 with 2332 with Fig. 1 in the special-purpose brake cam 2302 the special use braking boss 232 and 233 on the basic circles 2252 corresponding, produce through special-purpose brake rocker arm 2102.
Conventional valve motion curve 2202 is what to separate with auxiliary valve motion curve 2322 and 2332 among Fig. 4, and the open phase of two kinds of motions staggers.When the special-purpose brake rocker arm 2102 of special-purpose brake cam 2302 promotions moved, conventional rocking arm 210 was actionless.Auxiliary valve motion curve 2322 and 2332 valve liter (amount of opening) are less than the valve liter (amount of opening) of conventional valve motion curve 2202.Integrated form rocking arm braking system can strengthen conventional valve motion curve (cycle and the amount of holding) in the existing technology when braking, causes the power of engine braking to descend, and the oil nozzle temperature raises.Because auxiliary exhaust door drive mechanism 2002 of the present invention is two separate mechanisms with conventional exhaust valve driving mechanism 200; So the present invention the time can not strengthen conventional valve motion curve 2202 (cycle and the amount of holding) in braking, has identical conventional valve motion curve 2202 when operating with motor conventional (igniting) during the engine braking running.Therefore, the present invention has eliminated the braking force decline of integrated form rocking arm braking system in the existing technology, the shortcoming that the oil nozzle temperature raises.
Embodiment 2:
Fig. 2 is the embodiment's two of an auxiliary valve driving mechanism of the present invention schematic representation.The difference of present embodiment and the foregoing description one is axle sleeve drive unit 100.Embodiment one axle sleeve drive unit 100 is an internally-arranged type.Driven plunger 164 is positioned at auxiliary rocker arm (special-purpose brake rocker arm) within 2102 (Fig. 1).The axle sleeve drive unit 100 of present embodiment is an externally-arranged type.Have swing arm 1422 (Fig. 2) on the eccentric swing arm sleeve 188, cotter way 139 is arranged on the swing arm 1422.Be positioned at actuator (here for driveshaft) 1642 the pin 141 of the axle sleeve drive unit 100 outside the auxiliary rocker arm (special-purpose brake rocker arm) 2102, eccentric swing arm sleeve 188 is rotated between off position and operating position through being positioned at cotter way 139.Driveshaft 1642 can be the extension of driven plunger, can be other actuator also, like driving lead.Axle sleeve drive unit 100 can adopt different forms, from the simplest manual bicycle brake lead driving mechanism, to the automatic continuous variable driving mechanism; It can be the combination of mechanical, hydraulic type, electromagnetic type or several kinds of forms.When axle sleeve drive unit 100 adopted the driving mechanism of continuous variable, the amounts of rotation of eccentric swing arm sleeve 188 (operating position) was continuously adjustable, and the lift of engine exhaust port (aperture) also is continuously adjustable.When engine braking, the brake valve liter can be regulated according to the rotating speed of motor and the size of brake load etc. like this, optimizes braking ability.
Because conventional exhaust valve driving mechanism 200 of the present invention (Fig. 1) and auxiliary exhaust door drive mechanism 2002 (Fig. 1 and Fig. 2) are two separate mechanisms, routine (igniting) running of integrated form rocking arm braking system and influencing each other of engine braking running in the existing technology have been eliminated.Such as; Integrated form rocking arm braking system is in the process that starts and close in the existing technology; The integrated form rocking arm can bear the active force (valve spring power and cylinder pressure) that exhaust valve applies with its inner excentric sleeve, makes the reaction time lengthening that starts and close difficulty, engine braking.Also have, conventional (igniting) running operates shared same cam and same rocking arm with engine braking in the existing technology, and brake member increases like the frequency of utilization of excentric sleeve etc. greatly, and the probability of wearing and tearing and inefficacy is increase thereupon also.Auxiliary exhaust door drive mechanism 2002 of the present invention; Adopt special-purpose brake cam 2302 and special-purpose brake rocker arm 2102; In the process that starts and close, can not bear the active force (valve among Fig. 1 is pushed open by conventional exhaust valve driving mechanism 200, separates with special-purpose brake rocker arm 2102) that exhaust valve applies; Brake required driving force and reduce, reaction time shortens.Brake member of the present invention, far below spark rate (less than 10%), wearing and tearing and the probability that lost efficacy reduce like the frequency of utilization of excentric sleeve, special-purpose brake cam 2302 and special-purpose brake rocker arm 2102 etc., and the reliability and the durability of motor increase greatly.
Above-mentioned explanation has comprised a lot of concrete mode of executions, and this should not be regarded as limitation of the scope of the invention, but as representative concrete illustrations more of the present invention, many other differentiation all might therefrom produce.For instance, the auxiliary valve driving mechanism that shows here not only can be used to produce the auxiliary valve motion of engine braking, also can be used to produce other auxiliary valve motion such as exhaust gas recirculation.
In addition, the auxiliary valve driving mechanism that shows here not only can be used for overhead cam engine, also can be used for push rod/tubular type motor; Not only can be used for driving exhaust valve, also can be used to drive intake valve.
Also have, auxiliary valve driving mechanism described here not only can be used for driving single valve, also can be used for driving a plurality of valves, like dual valve.
Therefore, scope of the present invention should not decided by above-mentioned concrete illustration, but is decided by affiliated claim and the suitable power of law thereof.
Claims (8)
1. the auxiliary valve driving mechanism of a motor is used to produce the auxiliary valve motion of motor, and described motor comprises a conventional valve actuating mechanism; Described conventional valve actuating mechanism comprises conventional cam, conventional pitman arm shaft, conventional rocking arm and valve, and the described conventional rocking arm that moves through of described conventional cam passes to described valve to produce the conventional valve motion of motor, and it is characterized in that: described auxiliary valve driving mechanism comprises auxiliary cam, auxiliary rocker arm axle, auxiliary rocker arm, eccentric swing arm sleeve and axle sleeve drive unit; Described eccentric swing arm sleeve is arranged in the axis hole of described auxiliary rocker arm; Described auxiliary rocker arm axle is arranged in the eccentric swing arm sleeve, the axle center of auxiliary rocker arm axle and the biasing of the axle center of eccentric swing arm sleeve, and an end of auxiliary rocker arm and described auxiliary cam constitute kinematic pair; The other end of auxiliary rocker arm is positioned at the top of described valve; Described axle sleeve drive unit drives eccentric swing arm sleeve and between off position and operating position, rotates, at described off position, auxiliary rocker arm shake center line away from valve; Auxiliary rocker arm separates with valve; At described operating position, auxiliary rocker arm shake center line near valve, auxiliary rocker arm contacts with valve; The transmission of movement of auxiliary cam is given valve, produces the auxiliary valve motion of motor.
2. the auxiliary valve driving mechanism of motor as claimed in claim 1; It is characterized in that: have phase difference between the open phase in open phase in the described auxiliary valve motion and the described conventional valve motion, the valve of auxiliary valve motion rises the valve liter less than conventional valve motion.
3. the auxiliary valve driving mechanism of motor as claimed in claim 1; It is characterized in that: described auxiliary cam comprises special-purpose brake cam; Described auxiliary rocker arm comprises special-purpose brake rocker arm, and the auxiliary valve motion of described motor comprises the valve motion that is used for engine braking.
4. the auxiliary valve driving mechanism of motor as claimed in claim 1, it is characterized in that: described auxiliary rocker arm axle and described conventional pitman arm shaft are same pitman arm shaft, and described auxiliary rocker arm and conventional rocking arm are installed on the described pitman arm shaft abreast.
5. the auxiliary valve driving mechanism of motor as claimed in claim 1; It is characterized in that: described axle sleeve drive unit is the internally-arranged type driving mechanism; It is interior and adjacent with eccentric swing arm sleeve that the axle sleeve drive unit is arranged on auxiliary rocker arm; Described internally-arranged type driving mechanism comprises driven plunger, and described driven plunger is positioned at auxiliary rocker arm, and driven plunger drives eccentric swing arm sleeve and between off position and operating position, rotates.
6. the auxiliary valve driving mechanism of motor as claimed in claim 1; It is characterized in that: described axle sleeve drive unit is the externally-arranged type driving mechanism; Described externally-arranged type driving mechanism comprises actuator; Described actuator is positioned at outside the described auxiliary rocker arm, and actuator drives eccentric swing arm sleeve and between off position and operating position, rotates.
7. the auxiliary valve driving mechanism of motor as claimed in claim 1; It is characterized in that: described axle sleeve drive unit is a continuously variable driving mechanism; Described continuously variable driving mechanism drives described eccentric swing arm sleeve, and the operating position of described eccentric swing arm sleeve is adjustable continuously.
8. the auxiliary valve driving mechanism of motor as claimed in claim 1, it is characterized in that: comprise secondary spring in the described auxiliary valve driving mechanism, described secondary spring is biased in described auxiliary rocker arm the position of avoiding impacting valve.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110001373.7A CN102588030B (en) | 2011-01-05 | 2011-01-05 | The auxiliary valve driving mechanism of electromotor |
| EP11854595.3A EP2662542B1 (en) | 2011-01-05 | 2011-05-03 | Auxiliary valve actuating mechanism of engine |
| US13/978,366 US9416692B2 (en) | 2011-01-05 | 2011-05-03 | Auxiliary valve actuating mechanism of engine |
| PCT/CN2011/000769 WO2012092693A1 (en) | 2011-01-05 | 2011-05-03 | Auxiliary valve actuating mechanism of engine |
| US15/161,220 US9732643B2 (en) | 2011-01-05 | 2016-05-21 | Engine valve actuation mechanism for producing a variable engine valve event |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110001373.7A CN102588030B (en) | 2011-01-05 | 2011-01-05 | The auxiliary valve driving mechanism of electromotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102588030A true CN102588030A (en) | 2012-07-18 |
| CN102588030B CN102588030B (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110001373.7A Active CN102588030B (en) | 2011-01-05 | 2011-01-05 | The auxiliary valve driving mechanism of electromotor |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US9416692B2 (en) |
| EP (1) | EP2662542B1 (en) |
| CN (1) | CN102588030B (en) |
| WO (1) | WO2012092693A1 (en) |
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| CN103835780A (en) * | 2012-11-26 | 2014-06-04 | 上海尤顺汽车部件有限公司 | Auxiliary valve motion device of engine |
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| CN102588030B (en) * | 2011-01-05 | 2016-08-10 | 上海尤顺汽车部件有限公司 | The auxiliary valve driving mechanism of electromotor |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2662542B1 (en) | 2017-08-16 |
| CN102588030B (en) | 2016-08-10 |
| US9732643B2 (en) | 2017-08-15 |
| EP2662542A1 (en) | 2013-11-13 |
| EP2662542A4 (en) | 2016-06-22 |
| WO2012092693A1 (en) | 2012-07-12 |
| US20130269653A1 (en) | 2013-10-17 |
| US20160265399A1 (en) | 2016-09-15 |
| US9416692B2 (en) | 2016-08-16 |
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Address after: Fengxian District Shanghai Fengcheng town in 201411 Road No. 353 Patentee after: Shanghai Youshun Automobile Technology Co.,Ltd. Address before: Fengxian District Shanghai Fengcheng town in 201411 Road No. 353 Patentee before: Shanghai Universoon Autoparts Co.,Ltd. |
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